Observation of Excess J/ψ Yield at Very Low Transverse Momenta in Au+Au Collisions at sqrt[s_{NN}]=200  GeV and U+U Collisions at sqrt[s_{NN}]=193  GeV.

Autor: Adam J; Creighton University, Omaha, Nebraska 68178., Adamczyk L; AGH University of Science and Technology, FPACS, Cracow 30-059, Poland., Adams JR; Ohio State University, Columbus, Ohio 43210., Adkins JK; University of Kentucky, Lexington, Kentucky 40506-0055., Agakishiev G; Joint Institute for Nuclear Research, Dubna 141 980, Russia., Aggarwal MM; Panjab University, Chandigarh 160014, India., Ahammed Z; Variable Energy Cyclotron Centre, Kolkata 700064, India., Alekseev I; Alikhanov Institute for Theoretical and Experimental Physics, Moscow 117218, Russia.; National Research Nuclear University MEPhI, Moscow 115409, Russia., Anderson DM; Texas A&M University, College Station, Texas 77843., Aoyama R; University of Tsukuba, Tsukuba, Ibaraki 305-8571, Japan., Aparin A; Joint Institute for Nuclear Research, Dubna 141 980, Russia., Arkhipkin D; Brookhaven National Laboratory, Upton, New York 11973., Aschenauer EC; Brookhaven National Laboratory, Upton, New York 11973., Ashraf MU; Tsinghua University, Beijing 100084., Atetalla F; Kent State University, Kent, Ohio 44242., Attri A; Panjab University, Chandigarh 160014, India., Averichev GS; Joint Institute for Nuclear Research, Dubna 141 980, Russia., Bairathi V; National Institute of Science Education and Research, HBNI, Jatni 752050, India., Barish K; University of California, Riverside, California 92521., Bassill AJ; University of California, Riverside, California 92521., Behera A; State University of New York, Stony Brook, New York 11794., Bellwied R; University of Houston, Houston, Texas 77204., Bhasin A; University of Jammu, Jammu 180001, India., Bhati AK; Panjab University, Chandigarh 160014, India., Bielcik J; Czech Technical University in Prague, FNSPE, Prague 115 19, Czech Republic., Bielcikova J; Nuclear Physics Institute of the CAS, Rez 250 68, Czech Republic., Bland LC; Brookhaven National Laboratory, Upton, New York 11973., Bordyuzhin IG; Alikhanov Institute for Theoretical and Experimental Physics, Moscow 117218, Russia., Brandenburg JD; Brookhaven National Laboratory, Upton, New York 11973., Brandin AV; National Research Nuclear University MEPhI, Moscow 115409, Russia., Bryslawskyj J; University of California, Riverside, California 92521., Bunzarov I; Joint Institute for Nuclear Research, Dubna 141 980, Russia., Butterworth J; Rice University, Houston, Texas 77251., Caines H; Yale University, New Haven, Connecticut 06520., Sánchez MCB; University of California, Davis, California 95616., Cebra D; University of California, Davis, California 95616., Chakaberia I; Kent State University, Kent, Ohio 44242.; Shandong University, Qingdao, Shandong 266237., Chaloupka P; Czech Technical University in Prague, FNSPE, Prague 115 19, Czech Republic., Chan BK; University of California, Los Angeles, California 90095., Chang FH; National Cheng Kung University, Tainan 70101, Taiwan., Chang Z; Brookhaven National Laboratory, Upton, New York 11973., Chankova-Bunzarova N; Joint Institute for Nuclear Research, Dubna 141 980, Russia., Chatterjee A; Variable Energy Cyclotron Centre, Kolkata 700064, India., Chattopadhyay S; Variable Energy Cyclotron Centre, Kolkata 700064, India., Chen JH; Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201800., Chen X; University of Science and Technology of China, Hefei, Anhui 230026., Cheng J; Tsinghua University, Beijing 100084., Cherney M; Creighton University, Omaha, Nebraska 68178., Christie W; Brookhaven National Laboratory, Upton, New York 11973., Crawford HJ; University of California, Berkeley, California 94720., Csanad M; Eötvös Loránd University, Budapest H-1117, Hungary., Das S; Central China Normal University, Wuhan, Hubei 430079., Dedovich TG; Joint Institute for Nuclear Research, Dubna 141 980, Russia., Deppner IM; University of Heidelberg, Heidelberg 69120, Germany., Derevschikov AA; NRC 'Kurchatov Institute', Institute of High Energy Physics, Protvino 142281, Russia., Didenko L; Brookhaven National Laboratory, Upton, New York 11973., Dilks C; Pennsylvania State University, University Park, Pennsylvania 16802., Dong X; Lawrence Berkeley National Laboratory, Berkeley, California 94720., Drachenberg JL; Abilene Christian University, Abilene, Texas 79699., Dunlop JC; Brookhaven National Laboratory, Upton, New York 11973., Edmonds T; Purdue University, West Lafayette, Indiana 47907., Elsey N; Wayne State University, Detroit, Michigan 48201., Engelage J; University of California, Berkeley, California 94720., Eppley G; Rice University, Houston, Texas 77251., Esha R; University of California, Los Angeles, California 90095., Esumi S; University of Tsukuba, Tsukuba, Ibaraki 305-8571, Japan., Evdokimov O; University of Illinois at Chicago, Chicago, Illinois 60607., Ewigleben J; Lehigh University, Bethlehem, Pennsylvania 18015., Eyser O; Brookhaven National Laboratory, Upton, New York 11973., Fatemi R; University of Kentucky, Lexington, Kentucky 40506-0055., Fazio S; Brookhaven National Laboratory, Upton, New York 11973., Federic P; Nuclear Physics Institute of the CAS, Rez 250 68, Czech Republic., Fedorisin J; Joint Institute for Nuclear Research, Dubna 141 980, Russia., Feng Y; Purdue University, West Lafayette, Indiana 47907., Filip P; Joint Institute for Nuclear Research, Dubna 141 980, Russia., Finch E; Southern Connecticut State University, New Haven, Connecticut 06515., Fisyak Y; Brookhaven National Laboratory, Upton, New York 11973., Fulek L; AGH University of Science and Technology, FPACS, Cracow 30-059, Poland., Gagliardi CA; Texas A&M University, College Station, Texas 77843., Galatyuk T; Technische Universität Darmstadt, Darmstadt 64289, Germany., Geurts F; Rice University, Houston, Texas 77251., Gibson A; Valparaiso University, Valparaiso, Indiana 46383., Grosnick D; Valparaiso University, Valparaiso, Indiana 46383., Gupta A; University of Jammu, Jammu 180001, India., Guryn W; Brookhaven National Laboratory, Upton, New York 11973., Hamad AI; Kent State University, Kent, Ohio 44242., Hamed A; Texas A&M University, College Station, Texas 77843., Harris JW; Yale University, New Haven, Connecticut 06520., He L; Purdue University, West Lafayette, Indiana 47907., Heppelmann S; University of California, Davis, California 95616., Heppelmann S; Pennsylvania State University, University Park, Pennsylvania 16802., Herrmann N; University of Heidelberg, Heidelberg 69120, Germany., Holub L; Czech Technical University in Prague, FNSPE, Prague 115 19, Czech Republic., Hong Y; Lawrence Berkeley National Laboratory, Berkeley, California 94720., Horvat S; Yale University, New Haven, Connecticut 06520., Huang B; University of Illinois at Chicago, Chicago, Illinois 60607., Huang HZ; University of California, Los Angeles, California 90095., Huang SL; State University of New York, Stony Brook, New York 11794., Huang T; National Cheng Kung University, Tainan 70101, Taiwan., Huang X; Tsinghua University, Beijing 100084., Humanic TJ; Ohio State University, Columbus, Ohio 43210., Huo P; State University of New York, Stony Brook, New York 11794., Igo G; University of California, Los Angeles, California 90095., Jacobs WW; Indiana University, Bloomington, Indiana 47408., Jentsch A; University of Texas, Austin, Texas 78712., Jia J; Brookhaven National Laboratory, Upton, New York 11973.; State University of New York, Stony Brook, New York 11794., Jiang K; University of Science and Technology of China, Hefei, Anhui 230026., Jowzaee S; Wayne State University, Detroit, Michigan 48201., Ju X; University of Science and Technology of China, Hefei, Anhui 230026., Judd EG; University of California, Berkeley, California 94720., Kabana S; Kent State University, Kent, Ohio 44242., Kagamaster S; Lehigh University, Bethlehem, Pennsylvania 18015., Kalinkin D; Indiana University, Bloomington, Indiana 47408., Kang K; Tsinghua University, Beijing 100084., Kapukchyan D; University of California, Riverside, California 92521., Kauder K; Brookhaven National Laboratory, Upton, New York 11973., Ke HW; Brookhaven National Laboratory, Upton, New York 11973., Keane D; Kent State University, Kent, Ohio 44242., Kechechyan A; Joint Institute for Nuclear Research, Dubna 141 980, Russia., Kelsey M; Lawrence Berkeley National Laboratory, Berkeley, California 94720., Kikoła DP; Warsaw University of Technology, Warsaw 00-661, Poland., Kim C; University of California, Riverside, California 92521., Kinghorn TA; University of California, Davis, California 95616., Kisel I; Frankfurt Institute for Advanced Studies FIAS, Frankfurt 60438, Germany., Kisiel A; Warsaw University of Technology, Warsaw 00-661, Poland., Kocan M; Czech Technical University in Prague, FNSPE, Prague 115 19, Czech Republic., Kochenda L; National Research Nuclear University MEPhI, Moscow 115409, Russia., Kosarzewski LK; Czech Technical University in Prague, FNSPE, Prague 115 19, Czech Republic., Kramarik L; Czech Technical University in Prague, FNSPE, Prague 115 19, Czech Republic., Kravtsov P; National Research Nuclear University MEPhI, Moscow 115409, Russia., Krueger K; Argonne National Laboratory, Argonne, Illinois 60439., Mudiyanselage NK; University of Houston, Houston, Texas 77204., Kumar L; Panjab University, Chandigarh 160014, India., Elayavalli RK; Wayne State University, Detroit, Michigan 48201., Kwasizur JH; Indiana University, Bloomington, Indiana 47408., Lacey R; State University of New York, Stony Brook, New York 11794., Landgraf JM; Brookhaven National Laboratory, Upton, New York 11973., Lauret J; Brookhaven National Laboratory, Upton, New York 11973., Lebedev A; Brookhaven National Laboratory, Upton, New York 11973., Lednicky R; Joint Institute for Nuclear Research, Dubna 141 980, Russia., Lee JH; Brookhaven National Laboratory, Upton, New York 11973., Li C; University of Science and Technology of China, Hefei, Anhui 230026., Li W; Rice University, Houston, Texas 77251., Li W; Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201800., Li X; University of Science and Technology of China, Hefei, Anhui 230026., Li Y; Tsinghua University, Beijing 100084., Liang Y; Kent State University, Kent, Ohio 44242., Licenik R; Czech Technical University in Prague, FNSPE, Prague 115 19, Czech Republic., Lin T; Texas A&M University, College Station, Texas 77843., Lipiec A; Warsaw University of Technology, Warsaw 00-661, Poland., Lisa MA; Ohio State University, Columbus, Ohio 43210., Liu F; Central China Normal University, Wuhan, Hubei 430079., Liu H; Indiana University, Bloomington, Indiana 47408., Liu P; State University of New York, Stony Brook, New York 11794., Liu P; Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201800., Liu X; Ohio State University, Columbus, Ohio 43210., Liu Y; Texas A&M University, College Station, Texas 77843., Liu Z; University of Science and Technology of China, Hefei, Anhui 230026., Ljubicic T; Brookhaven National Laboratory, Upton, New York 11973., Llope WJ; Wayne State University, Detroit, Michigan 48201., Lomnitz M; Lawrence Berkeley National Laboratory, Berkeley, California 94720., Longacre RS; Brookhaven National Laboratory, Upton, New York 11973., Luo S; University of Illinois at Chicago, Chicago, Illinois 60607., Luo X; Central China Normal University, Wuhan, Hubei 430079., Ma GL; Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201800., Ma L; Fudan University, Shanghai, 200433., Ma R; Brookhaven National Laboratory, Upton, New York 11973., Ma YG; Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201800., Magdy N; University of Illinois at Chicago, Chicago, Illinois 60607., Majka R; Yale University, New Haven, Connecticut 06520., Mallick D; National Institute of Science Education and Research, HBNI, Jatni 752050, India., Margetis S; Kent State University, Kent, Ohio 44242., Markert C; University of Texas, Austin, Texas 78712., Matis HS; Lawrence Berkeley National Laboratory, Berkeley, California 94720., Matonoha O; Czech Technical University in Prague, FNSPE, Prague 115 19, Czech Republic., Mazer JA; Rutgers University, Piscataway, New Jersey 08854., Meehan K; University of California, Davis, California 95616., Mei JC; Shandong University, Qingdao, Shandong 266237., Minaev NG; NRC 'Kurchatov Institute', Institute of High Energy Physics, Protvino 142281, Russia., Mioduszewski S; Texas A&M University, College Station, Texas 77843., Mishra D; National Institute of Science Education and Research, HBNI, Jatni 752050, India., Mohanty B; National Institute of Science Education and Research, HBNI, Jatni 752050, India., Mondal MM; Institute of Physics, Bhubaneswar 751005, India., Mooney I; Wayne State University, Detroit, Michigan 48201., Moravcova Z; Czech Technical University in Prague, FNSPE, Prague 115 19, Czech Republic., Morozov DA; NRC 'Kurchatov Institute', Institute of High Energy Physics, Protvino 142281, Russia., Nasim M; University of California, Los Angeles, California 90095., Nayak K; Central China Normal University, Wuhan, Hubei 430079., Nelson JM; University of California, Berkeley, California 94720., Nemes DB; Yale University, New Haven, Connecticut 06520., Nie M; Shandong University, Qingdao, Shandong 266237., Nigmatkulov G; National Research Nuclear University MEPhI, Moscow 115409, Russia., Niida T; Wayne State University, Detroit, Michigan 48201., Nogach LV; NRC 'Kurchatov Institute', Institute of High Energy Physics, Protvino 142281, Russia., Nonaka T; Central China Normal University, Wuhan, Hubei 430079., Odyniec G; Lawrence Berkeley National Laboratory, Berkeley, California 94720., Ogawa A; Brookhaven National Laboratory, Upton, New York 11973., Oh K; Pusan National University, Pusan 46241, Korea., Oh S; Yale University, New Haven, Connecticut 06520., Okorokov VA; National Research Nuclear University MEPhI, Moscow 115409, Russia., Page BS; Brookhaven National Laboratory, Upton, New York 11973., Pak R; Brookhaven National Laboratory, Upton, New York 11973., Panebratsev Y; Joint Institute for Nuclear Research, Dubna 141 980, Russia., Pawlik B; Institute of Nuclear Physics PAN, Cracow 31-342, Poland., Pei H; Central China Normal University, Wuhan, Hubei 430079., Perkins C; University of California, Berkeley, California 94720., Pinter RL; Eötvös Loránd University, Budapest H-1117, Hungary., Pluta J; Warsaw University of Technology, Warsaw 00-661, Poland., Porter J; Lawrence Berkeley National Laboratory, Berkeley, California 94720., Posik M; Temple University, Philadelphia, Pennsylvania 19122., Pruthi NK; Panjab University, Chandigarh 160014, India., Przybycien M; AGH University of Science and Technology, FPACS, Cracow 30-059, Poland., Putschke J; Wayne State University, Detroit, Michigan 48201., Quintero A; Temple University, Philadelphia, Pennsylvania 19122., Radhakrishnan SK; Lawrence Berkeley National Laboratory, Berkeley, California 94720., Ramachandran S; University of Kentucky, Lexington, Kentucky 40506-0055., Ray RL; University of Texas, Austin, Texas 78712., Reed R; Lehigh University, Bethlehem, Pennsylvania 18015., Ritter HG; Lawrence Berkeley National Laboratory, Berkeley, California 94720., Roberts JB; Rice University, Houston, Texas 77251., Rogachevskiy OV; Joint Institute for Nuclear Research, Dubna 141 980, Russia., Romero JL; University of California, Davis, California 95616., Ruan L; Brookhaven National Laboratory, Upton, New York 11973., Rusnak J; Nuclear Physics Institute of the CAS, Rez 250 68, Czech Republic., Rusnakova O; Czech Technical University in Prague, FNSPE, Prague 115 19, Czech Republic., Sahoo NR; Texas A&M University, College Station, Texas 77843., Sahu PK; Institute of Physics, Bhubaneswar 751005, India., Salur S; Rutgers University, Piscataway, New Jersey 08854., Sandweiss J; Yale University, New Haven, Connecticut 06520., Schambach J; University of Texas, Austin, Texas 78712., Schmidke WB; Brookhaven National Laboratory, Upton, New York 11973., Schmitz N; Max-Planck-Institut für Physik, Munich 80805, Germany., Schweid BR; State University of New York, Stony Brook, New York 11794., Seck F; Technische Universität Darmstadt, Darmstadt 64289, Germany., Seger J; Creighton University, Omaha, Nebraska 68178., Sergeeva M; University of California, Los Angeles, California 90095., Seto R; University of California, Riverside, California 92521., Seyboth P; Max-Planck-Institut für Physik, Munich 80805, Germany., Shah N; Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201800., Shahaliev E; Joint Institute for Nuclear Research, Dubna 141 980, Russia., Shanmuganathan PV; Lehigh University, Bethlehem, Pennsylvania 18015., Shao M; University of Science and Technology of China, Hefei, Anhui 230026., Shen F; Shandong University, Qingdao, Shandong 266237., Shen WQ; Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201800., Shi SS; Central China Normal University, Wuhan, Hubei 430079., Shou QY; Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201800., Sichtermann EP; Lawrence Berkeley National Laboratory, Berkeley, California 94720., Siejka S; Warsaw University of Technology, Warsaw 00-661, Poland., Sikora R; AGH University of Science and Technology, FPACS, Cracow 30-059, Poland., Simko M; Nuclear Physics Institute of the CAS, Rez 250 68, Czech Republic., JSingh; Panjab University, Chandigarh 160014, India., Singha S; Kent State University, Kent, Ohio 44242., Smirnov D; Brookhaven National Laboratory, Upton, New York 11973., Smirnov N; Yale University, New Haven, Connecticut 06520., Solyst W; Indiana University, Bloomington, Indiana 47408., Sorensen P; Brookhaven National Laboratory, Upton, New York 11973., Spinka HM; Argonne National Laboratory, Argonne, Illinois 60439., Srivastava B; Purdue University, West Lafayette, Indiana 47907., Stanislaus TDS; Valparaiso University, Valparaiso, Indiana 46383., Stewart DJ; Yale University, New Haven, Connecticut 06520., Strikhanov M; National Research Nuclear University MEPhI, Moscow 115409, Russia., Stringfellow B; Purdue University, West Lafayette, Indiana 47907., Suaide AAP; Universidade de São Paulo, São Paulo, Brazil 05314-970., Sugiura T; University of Tsukuba, Tsukuba, Ibaraki 305-8571, Japan., Sumbera M; Nuclear Physics Institute of the CAS, Rez 250 68, Czech Republic., Summa B; Pennsylvania State University, University Park, Pennsylvania 16802., Sun XM; Central China Normal University, Wuhan, Hubei 430079., Sun Y; University of Science and Technology of China, Hefei, Anhui 230026., Sun Y; Huzhou University, Zhejiang 313000., Surrow B; Temple University, Philadelphia, Pennsylvania 19122., Svirida DN; Alikhanov Institute for Theoretical and Experimental Physics, Moscow 117218, Russia., Szymanski P; Warsaw University of Technology, Warsaw 00-661, Poland., Tang AH; Brookhaven National Laboratory, Upton, New York 11973., Tang Z; University of Science and Technology of China, Hefei, Anhui 230026., Taranenko A; National Research Nuclear University MEPhI, Moscow 115409, Russia., Tarnowsky T; Michigan State University, East Lansing, Michigan 48824., Thomas JH; Lawrence Berkeley National Laboratory, Berkeley, California 94720., Timmins AR; University of Houston, Houston, Texas 77204., Todoroki T; Brookhaven National Laboratory, Upton, New York 11973., Tokarev M; Joint Institute for Nuclear Research, Dubna 141 980, Russia., Tomkiel CA; Lehigh University, Bethlehem, Pennsylvania 18015., Trentalange S; University of California, Los Angeles, California 90095., Tribble RE; Texas A&M University, College Station, Texas 77843., Tribedy P; Brookhaven National Laboratory, Upton, New York 11973., Tripathy SK; Institute of Physics, Bhubaneswar 751005, India., Tsai OD; University of California, Los Angeles, California 90095., Tu B; Central China Normal University, Wuhan, Hubei 430079., Ullrich T; Brookhaven National Laboratory, Upton, New York 11973., Underwood DG; Argonne National Laboratory, Argonne, Illinois 60439., Upsal I; Brookhaven National Laboratory, Upton, New York 11973.; Shandong University, Qingdao, Shandong 266237., Van Buren G; Brookhaven National Laboratory, Upton, New York 11973., Vanek J; Nuclear Physics Institute of the CAS, Rez 250 68, Czech Republic., Vasiliev AN; NRC 'Kurchatov Institute', Institute of High Energy Physics, Protvino 142281, Russia., Vassiliev I; Frankfurt Institute for Advanced Studies FIAS, Frankfurt 60438, Germany., Videbæk F; Brookhaven National Laboratory, Upton, New York 11973., Vokal S; Joint Institute for Nuclear Research, Dubna 141 980, Russia., Voloshin SA; Wayne State University, Detroit, Michigan 48201., Wang F; Purdue University, West Lafayette, Indiana 47907., Wang G; University of California, Los Angeles, California 90095., Wang P; University of Science and Technology of China, Hefei, Anhui 230026., Wang Y; Central China Normal University, Wuhan, Hubei 430079., Wang Y; Tsinghua University, Beijing 100084., Webb JC; Brookhaven National Laboratory, Upton, New York 11973., Wen L; University of California, Los Angeles, California 90095., Westfall GD; Michigan State University, East Lansing, Michigan 48824., Wieman H; Lawrence Berkeley National Laboratory, Berkeley, California 94720., Wissink SW; Indiana University, Bloomington, Indiana 47408., Witt R; United States Naval Academy, Annapolis, Maryland 21402., Wu Y; Kent State University, Kent, Ohio 44242., Xiao ZG; Tsinghua University, Beijing 100084., Xie G; University of Illinois at Chicago, Chicago, Illinois 60607., Xie W; Purdue University, West Lafayette, Indiana 47907., Xu H; Huzhou University, Zhejiang 313000., Xu N; Lawrence Berkeley National Laboratory, Berkeley, California 94720., Xu QH; Shandong University, Qingdao, Shandong 266237., Xu YF; Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201800., Xu Z; Brookhaven National Laboratory, Upton, New York 11973., Yang C; Shandong University, Qingdao, Shandong 266237., Yang Q; Shandong University, Qingdao, Shandong 266237., Yang S; Brookhaven National Laboratory, Upton, New York 11973., Yang Y; National Cheng Kung University, Tainan 70101, Taiwan., Ye Z; Rice University, Houston, Texas 77251., Ye Z; University of Illinois at Chicago, Chicago, Illinois 60607., Yi L; Shandong University, Qingdao, Shandong 266237., Yip K; Brookhaven National Laboratory, Upton, New York 11973., Yoo IK; Pusan National University, Pusan 46241, Korea., Zbroszczyk H; Warsaw University of Technology, Warsaw 00-661, Poland., Zha W; University of Science and Technology of China, Hefei, Anhui 230026., Zhang D; Central China Normal University, Wuhan, Hubei 430079., Zhang L; Central China Normal University, Wuhan, Hubei 430079., Zhang S; University of Science and Technology of China, Hefei, Anhui 230026., Zhang S; Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201800., Zhang XP; Tsinghua University, Beijing 100084., Zhang Y; University of Science and Technology of China, Hefei, Anhui 230026., Zhang Z; Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201800., Zhao J; Purdue University, West Lafayette, Indiana 47907., Zhong C; Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201800., Zhou C; Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201800., Zhu X; Tsinghua University, Beijing 100084., Zhu Z; Shandong University, Qingdao, Shandong 266237., Zurek MK; Lawrence Berkeley National Laboratory, Berkeley, California 94720., Zyzak M; Frankfurt Institute for Advanced Studies FIAS, Frankfurt 60438, Germany.
Jazyk: angličtina
Zdroj: Physical review letters [Phys Rev Lett] 2019 Sep 27; Vol. 123 (13), pp. 132302.
DOI: 10.1103/PhysRevLett.123.132302
Abstrakt: We report on the first measurements of J/ψ production at very low transverse momentum (p_{T}<0.2  GeV/c) in hadronic Au+Au collisions at sqrt[s_{NN}]=200  GeV and U+U collisions at sqrt[s_{NN}]=193  GeV. Remarkably, the inferred nuclear modification factor of J/ψ at midrapidity in Au+Au (U+U) collisions reaches about 24 (52) for p_{T}<0.05  GeV/c in the 60%-80% collision centrality class. This noteworthy enhancement cannot be explained by hadronic production accompanied by cold and hot medium effects. In addition, the dN/dt distribution of J/ψ for the very low p_{T} range is presented for the first time. The distribution is consistent with that expected from the Au nucleus and shows a hint of interference. Comparison of the measurements to theoretical calculations of coherent production shows that the excess yield can be described reasonably well and reveals a partial disruption of coherent production in semicentral collisions, perhaps due to the violent hadronic interactions. Incorporating theoretical calculations, the results strongly suggest that the dramatic enhancement of J/ψ yield observed at extremely low p_{T} originates from coherent photon-nucleus interactions. In particular, coherently produced J/ψ's in violent hadronic collisions may provide a novel probe of the quark-gluon plasma.
Databáze: MEDLINE